Electric heating – Metal heating – By arc
Patent
1998-08-06
2000-04-04
Mills, Gregory
Electric heating
Metal heating
By arc
21912168, 21912169, 2191217, 21912171, 21912172, 21912183, 21912184, 21912185, B23K 2602
Patent
active
060464275
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention concerns a device to cut, perforate, or inscribe repeating patterns in continuously-moving flat material, especially a sandwich material, by locally vaporizing the sheet with at least one controllable laser beam from at least one beam deflection system, wherein each laser beam is moved relative to the flat material in two perpendicular directions (x and y) from a fixed point. The invention also concerns a corresponding device.
In EP 0 357 841 A1, a device is disclosed to create predetermined separation lines/perforations with laser beams. To locally vaporize a part of one-layer or multiple-layer packaging material, there is a controllable laser beam for creating repeating images/patterns as the sheet of packaging material continuously moves. Fast changes in speed cannot be executed in the prior art procedure. The starting signal for introducing the structures are created when repeating printed images on the packaging material are detected. This causes the introduced lines/perforations to agree with the printed pattern on the sheet of material.
Since an existing printed pattern is required to control the laser scanning system in the prior art device, unprinted material cannot be processed. In addition, a faulty print on the flat material causes the laser-beam-generated line or perforation to be incorrect since it depends on the printed pattern.
In the prior art device, the surface speed is detected with an incremental, rotating shaft encoder. While the cut or perforation is being created, the focal length of the laser beam is adjusted so that the focus is always the same. Simultaneously, the recurring images on the packaging material are monitored by a feedback loop to the image-dependent control signals in order to create the notches fully aligned with the repeating patterns.
In addition, laser beam deflection systems are known per se in which the laser beam is deflected by mirror galvanometer systems that are also known per se. For example, this is the case in FR 25 76 836 A1 in which a laser system is described that is stationary in the x and y direction and can only be changed in the z direction to adjust the focal length of the laser beam.
The problem of the invention is to design and develop a procedure and device to cut or perforate repeating patterns in continuously moving flat material so that a pattern can be created which is in alignment with the bent and folded edges in unprinted material at any speed.
In particular, flat material speeds can be reached of up to 300 m/min.
In regard to the process, this problem is solved by the following steps: its position. perforation or writing process depending on a synchronization pulse generated when the bent or folded edges are detected, and the detected rate of the flat material, and the detected rate of the flat material and the detected bent or folded edges.
The bent or folded edges are created and their position can be detected in a single step as is the case with the embodiment described in the figures.
In one advantageous embodiment of the invention, the position of the generated pattern is monitored and regulated in relation to the created bent or folded edges.
In regard to the device, the problem is solved in that an element is provided to determine the speed of the flat material; at least one stamping tool is provided to introduce bent or folded edges in the moving flat material; and the stamping tool is provided with an incremental shaft encoder with which the position of the stamping tool edges is detected in reference to the flat material which creates a synchronization pulse to control the beam deflection system(s) that execute the cutting, perforation or writing procedure.
With the device according to the invention, a rate-independent, aligned relationship is created between the bend or fold pattern and the cut or laser perforation or inscription. In contrast to the above-described state of the art, the cut, perforation or inscription can be created on an unprinted flat material.
In addit
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Kutschki Uwe
Mosig Michael
Nittner Michael
Richter Anke
Schmidt Eberhard
Mills Gregory
SIG Combibloc GmbH
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